Alexandre Savaris <alexandre(dot)savaris(at)gmail(dot)com> writes:
> Hi! I'm working on an implementation for a new data type (PostgreSQL
> version 9.1 beta 3 on Windows 7 32 bits), according to the following rules:
> - 1. NULL values are stored as is;
> - 2. character strings (up to 16 bytes) are stored without leading or
> trailing spaces;
> - 3. empty character strings are stored as NULL values.
*buzzz* wrong answer, thanks for playing.
Data types do not get to editorialize on null versus not null. Forget
your cute idea #3, and you'll be much happier.
regards, tom lane